ASP.NET筆記之 Httphandler的操作詳解

更新時(shí)間：2013年04月23日 14:36:38 作者：

本篇文章小編為大家介紹，ASP.NET筆記之 Httphandler的操作詳解。需要的朋友參考下

1、httphandler

實(shí)例1：通過生成一張動(dòng)態(tài)圖片輸出客戶端的IP地址、操作系統(tǒng)類型、瀏覽器類型

復(fù)制代碼代碼如下:

<%@ WebHandler Language="C#" Class="visitor" %>

using System;
using System.Web;

public class visitor : IHttpHandler {

    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "image/JPEG";
        using (System.Drawing.Bitmap bitImage = new System.Drawing.Bitmap(330, 300))
        {
            //設(shè)置畫布
            using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitImage))
            {
                //IP
                g.DrawString("IP:" + context.Request.UserHostAddress, new System.Drawing.Font("宋體", 20), System.Drawing.Brushes.Red, new System.Drawing.PointF(0, 0));
                //操作系統(tǒng)
                g.DrawString("操作系統(tǒng):" + context.Request.Browser.Platform, new System.Drawing.Font("宋體", 20), System.Drawing.Brushes.Red, new System.Drawing.PointF(0, 50));
                //瀏覽器
                g.DrawString("瀏覽器:" + context.Request.Browser.Type, new System.Drawing.Font("宋體", 20), System.Drawing.Brushes.Red, new System.Drawing.PointF(0, 100));
            }
            //保存到輸出流中
            bitImage.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

        }
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

}

實(shí)例2：通過“下載”連接，彈出用戶附件保存

html代碼：<a href="dowload.ashx">下載</a>

復(fù)制代碼代碼如下:

<%@ WebHandler Language="C#" Class="dowload" %>

using System;
using System.Web;

public class dowload : IHttpHandler {

    public void ProcessRequest(HttpContext context)
    {
        string fileName = HttpUtility.UrlEncode("悲劇.jpg");
        context.Response.ContentType = "image/JPEG";

        //打開附件對(duì)話框報(bào)文頭header和設(shè)置它的值
        context.Response.AddHeader("Content-Disposition", "attachment:filename=" + fileName);
        context.Response.WriteFile("蘋果.jpg");
    }

    public bool IsReusable {
        get {
            return false;
        }
    }

}